USN-3199-1 fixed a vulnerability in the Python Cryptography Toolkit.Unfortunately, various programs depended on the original behavior of the PythonCryptography Toolkit which was altered when fixing the vulnerability. Thisupdate retains the fix for the vulnerability but issues a warning rather thanthrowing an exception. Code which produces this warning should be updatedbecause future versions of the Python Cryptography Toolkit re-introduce theexception.

We apologize for the inconvenience.

Original advisory details:

Â It was discovered that the ALGnew function in block_template.c in the PythonÂ Cryptography Toolkit contained a heap-based buffer overflow vulnerability.Â A remote attacker could use this flaw to execute arbitrary code by usingÂ a crafted initialization vector parameter.

Update instructions:

The problem can be corrected by updating your system to the followingpackage versions: